Toffoli Gate
IntermediateToffoli Gate is a universal three-qubit gate, also known as CCNOT, that flips a target qubit if and only if two control qubits are both in the |1⟩ state.
In Plain English
Imagine a high-security vault that requires two managers to turn their keys simultaneously to open the door. The door (target qubit) only changes state when both managers' keys (the two control qubits) are turned. If only one or neither key is turned, the door remains securely shut.
Why It Matters for Your Career
Quantum Algorithm Developers use Toffoli gates to build complex subroutines like arithmetic, making them a frequent topic in technical interviews at companies like IBM Quantum or Rigetti. Quantum Compiler Engineers must understand how to efficiently decompose Toffoli gates into native hardware operations.
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